package com.liujiaqi.filter;

import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;

import java.io.IOException;

//@WebFilter(urlPatterns = "/*")
public class DemoFilter implements Filter {

  @Override // 初始化方法，只会被调用一次
  public void init(FilterConfig filterConfig) throws ServletException {
    System.out.println("init 初始化方法执行了");
    Filter.super.init(filterConfig);
  }

  @Override // 拦截请求之后调用，调用多次
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    System.out.println("Demo 拦截了请求...放行前逻辑");
    // 放行
    filterChain.doFilter(servletRequest, servletResponse);

    System.out.println("Demo 拦截了请求...放行后逻辑");
  }

  @Override // 销毁方法，只会被调用一次
  public void destroy() {
    System.out.println("destroy 销毁方法执行了");
    Filter.super.destroy();
  }
}
